Append a value to a certain page’s URL before page load

In the example you link this is how the parameter is added:

add_query_arg( 'sort', $my_parameter, $link );

However, in your example you missed the link parameter.

Does it work if you replace it with:

$link = add_query_arg( 'tubepress_video', $my_parameter, $link );

?

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)